Having a crush does involve serotonin, but it's a bit counterintuitive: the exciting, obsessive feelings of a crush are linked to lower serotonin levels (similar to OCD), while other "happy" chemicals like dopamine and norepinephrine surge, creating motivation, pleasure, and that giddy, high-energy feeling. So, while you get the rush from other chemicals, the drop in serotonin contributes to the intense focus and obsessive thinking often associated with a crush, alongside the dopamine-driven reward.
When we develop a crush, serotonin levels decrease with an increase in cortisol, making it common to experience sleeplessness⁶. Attraction to someone can also increase our adrenaline and cortisol levels⁷, hormones that are released during a human stress response.
Being love-struck also releases high levels of dopamine, a chemical that “gets the reward system going,” said Olds. Dopamine activates the reward circuit, helping to make love a pleasurable experience similar to the euphoria associated with use of cocaine or alcohol.
Your serotonin levels decrease.
Early romantic love is associated with reduced serotonin levels, like levels seen in obsessive compulsive disorder. That may be why we tend to obsess about our new lover and may experience stress and anxiety.
Neuroscience Behind Attraction
When we experience attraction or develop a crush, chemicals are released in the brain creating a stress and reward response. The first spark of attraction happens in the ventral tegmental area of the brain which produces the “feel good” neurotransmitter known as dopamine.
The 2-2-2 rule in love is a relationship guideline to keep connections strong by scheduling regular, dedicated time together: a date night every two weeks, a weekend getaway every two months, and a week-long vacation every two years, helping couples prioritize each other and break daily routines to maintain intimacy and fun.
You feel it. "You'll have a physical response to someone. You often feel a chemical response, like a faster heartbeat or a sense of excitement, when you are around them. You are likely attracted to them," says Elizabeth Overstreet, a relationship strategist, speaker, and author.
Just six seconds of presence. Dr. Gottman calls it a daily ritual for a reason. It builds connection, lowers stress, and reminds you that you're in this together.
The first love is lust and is founded primarily on sexual attraction, and the second love is intimacy and is founded on compatibility (as well as sexual attraction). The third love is commitment, and it involves lust and intimacy as well as the decision to commit to one another through life's ups and downs.
The "3-month rule" for a crush suggests waiting around 90 days to see if the initial intense infatuation (honeymoon phase) settles, revealing the person's true character, compatibility, and whether they're serious about a real relationship, making it a trial period to decide on commitment or moving on. It helps gauge consistency and emotional safety after the "spark" fades, identifying potential red flags like love-bombing or toxicity, though experts note it's a guideline, not a rigid rule, as deeper connection takes time and varies.
Men Tend to Fall in Love Faster Than Women, New Study Shows. It sets your heart racing, it puts butterflies in your stomach, and is a non-stop distraction for your mind – but that feeling we call love is something men fall into more quickly than women, according to new research.
Oxytocin is a neuropeptide associated with romantic and sexual attraction. It can increase the amount of dopamine, a neurotransmitter and hormone known to be involved with concentration and excitement, that's released in the brain, which leads you to feel more focused on a particular stimulus: in this case, your crush.
Oxytocin is well-known for its role in promoting emotional bonding and social interactions. This hormone is behind those butterflies when you first fall in love, that warm glow during a hug, and even the deep connection you feel with your closest friends or family.
There are ways to naturally increase serotonin levels in your body, through lifestyle measures such as by:
But it does provide some rough guidelines as to how soon may be too soon to make long-term commitments and how long may be too long to stick with a relationship. Each of the three numbers—three, six, and nine—stands for the month that a different common stage of a relationship tends to end.
Serotonin: Serotonin is released after sexual activity, contributing to feelings of contentment, satisfaction, and optimism in life. It is involved in mood regulation and combating depression.
The 90/10 kissing rule, popularized by the movie Hitch, suggests that one person leans in 90% of the way for a kiss and pauses, allowing the other person to close the remaining 10%, which signals their consent and involvement, preventing it from feeling forced and creating anticipation. This technique gives the other person control, allowing them to either lean in for the kiss or pull away, indicating their comfort level.
The strongest indicator of attraction is often considered sustained, meaningful eye contact, especially when combined with other cues like leaning in or pupil dilation, as it signals interest and intimacy, but the most reliable confirmation is always direct communication like verbal consent or expressing interest. Other key indicators include positive body language (leaning in, mirroring), increased physical closeness, frequent smiling, and a strong desire to learn about the other person, with biological factors like scent also playing a role.
The 7-7-7 rule for couples is a guideline for maintaining strong connection by scheduling dedicated time: a date night every 7 days, a weekend getaway (or night away) every 7 weeks, and a longer, kid-free vacation every 7 months, all designed to fight drift and routine by ensuring consistent, intentional quality time, though flexibility is key.
Signs Your Partner Is Feeling Lust
Things get physical fast. They don't seem interested in your life outside of the bedroom. They don't share details of their life with you. They aren't interested in sharing their emotions (or hearing about yours)
The 2-2-2 rule is a relationship strategy designed to help couples maintain closeness by creating regular moments of connection. The concept is simple: every two weeks, go on a date; every two months, plan a weekend getaway; and every two years, go on a longer trip together.
survived the dreaded two-year mark (i.e. the most common time period when couples break up), then you're destined to be together forever… right? Unfortunately, the two-year mark isn't the only relationship test to pass, nor do you get to relax before the seven-year itch.
Falling in love typically takes a few months. Love at first sight is likely an expression of strong lust or physical desire that transforms over time into romantic love for each other. There is no definitive time frame for falling in love, though about 3–4 months may be a rough average, according to limited research.